function mouse_on_top(a) {
a.style.backgroundColor = '#06F';
var elems = a.getElementsByTagName('*');
for(var i=0; i<elems.length; i++) elems[i].style.color = '#FFF';
}

function mouse_off_top(a) {
a.style.backgroundColor = '';
var elems = a.getElementsByTagName('*');
for(var i=0; i<elems.length; i++) elems[i].style.color = '#906';
}

function mouse_on_bot(a) {
a.style.backgroundColor = '#FFF';
var elems = a.getElementsByTagName('*');
for(var i=0; i<elems.length; i++) elems[i].style.color = '#000';
}

function mouse_off_bot(a) {
a.style.backgroundColor = '';
var elems = a.getElementsByTagName('*');
for(var i=0; i<elems.length; i++) elems[i].style.color = '#FFF';
}